When you say "unplugging and plugging back in", are you referring to the power cable or the HDMI connection to the TV? Make sure you're unplugging the power cable or perform a System restart found under Settings->System or Settings->System->Power.
It might help to know what kind of remote you have. If it's a voice remote, try resetting it by pressing and holding both the Home and Back buttons (the two buttons next to each other at the top of the remote) for 20 seconds. Although, given that the mobile app gives the same results, that may not accomplish anything.